(57) An array of picture elements in rows ℓ1, f2, etc provides inputs to vertical charge coupled device (CCD) registers which feed
into a horizontal CCD register which provides the video output. In even fields transfers
are made from even rows ℓ2, f4, etc and then, after a one element shift from odd rows ℓ1, P3, etc so that combined signals ℓ1 + ℓ2, ℓ3 + ℓ4, etc are formed.
Similarly in even fields the combined signals are ℓ2 + ℓ3, ℓ4 + ℓ5, etc. The elements have colour filters establishing a 2-element horizontal by 4-element
vertical repeat pattern wherein a green component comes from all elements whereas
red and blue components are modulated at a 2-element horizontal rate with a line to
line phase alternation applying to one of these components, but not the other. In
accordance with the invention the said pattern is established using transparent (W),
green (G), yellow (Ye) and cyan (Cy) filters, where transparent passes all components,
yellow passes red and green and cyan passes blue and green.
Every row has at least one filter passing red and at least one passing blue within
each 2 by 4 pattern block but the modulation of red and blue is retained as red components
pass only alternate filters in odd lines (with phase alternation) whereas blue components
pass only alternate filters in even lines (without phase alternation).
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